A device and method for testing the tackiness of a paint film

Abstract

The application relates to the technical field of tackiness detection, and discloses a paint film tackiness testing device and method, wherein a cylindrical first test piece and a second test piece are used, so that when the first test piece and the second test piece after paint film preparation are in contact, the length of a contact surface is the length of the first test piece and the second test piece, the width of the contact surface can be approximately ignored, therefore when the paint film damage area is measured, only the length needs to be measured, the damage proportion of the paint film can be calculated, the measurement precision is higher, the obtained experimental data is more accurate, and the measurement is more convenient; in addition, a plurality of positioning grooves are arranged, so that a plurality of groups of experiments can be carried out at a time during the testing, a plurality of groups of experimental data are obtained, the accuracy of the experimental data is ensured, and the contact and extrusion between the paint films are simulated in the testing, so that the actual situation of the paint film in the use process can be effectively simulated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tackiness detection, in particular to a paint film tackiness testing device and method. BACKGROUND

[0002] The paint film refers to a solid continuous film formed by one or more coating layers of paint applied to the substrate. Generally, the paint film is composed of multiple coating layers, and the number of coating layers is determined according to the requirements of the coated object, and generally includes a primer layer, an intermediate coating layer and a topcoat layer. The paint film is widely used in the industrial field. The tackiness of the paint film refers to the phenomenon that the paint film adheres after drying due to the influence of certain temperature and humidity. The test of the tackiness of the paint film is of great significance to ensure the integrity, decorative and protective effects of the paint film.

[0003] The existing test method is GB / T 1762-1980 "Paint Film Tackiness Test Method". The "Paint Film Tackiness Test Method" tests the tackiness of the paint film on the tinplate. The main test method is to prepare a paint film on the tinplate, place filter paper on the surface of the paint film after drying, and adjust the temperature and humidity environment. By applying a certain pressure on the filter paper, the filter paper is pressed to contact the paint film. The ease of separation of the filter paper and the paint film is observed to determine the anti-tackiness of the paint film. However, this method has limitations. It only simulates part of the paint film in use. In the test process, the position of the filter paper needs to be manually adjusted to align with the paint film. At the same time, a microscope is needed to observe the damaged area, which is prone to errors and affects the test results. SUMMARY

[0004] The purpose of the present application is to provide a paint film tackiness testing device and method which can effectively simulate the real situation of the paint film in use and is easy to operate and accurate in results.

[0005] In order to achieve the above purpose, the present application provides a paint film tackiness testing device, comprising a base plate, a support, a top plate, a plurality of first test pieces and a plurality of second test pieces.

[0006] The top surface of the base plate is provided with a plurality of positioning grooves extending in a first direction, and the plurality of positioning grooves are arranged in a second direction in sequence.

[0007] The first test piece and the second test piece are both cylindrical, both extend in the first direction and have the same length in the first direction. The plurality of first test pieces are respectively arranged in the plurality of positioning grooves. The second test piece is arranged between the two adjacent first test pieces, and the outer circumferential surface of the second test piece is overlapped on the outer circumferential surfaces of the two adjacent first test pieces.

[0008] The support is arranged on the top surface of the bottom plate and spaced from the positioning groove, and the support is provided with a track extending in a third direction;

[0009] The top plate is slidingly connected to the track and can move along the track to contact the outer circumferential surface of the second test piece.

[0010] Preferably, a counterweight assembly is further included, the counterweight assembly includes a fixing column and a counterweight piece, the fixing column is installed on the side of the top plate away from the bottom plate, and the counterweight piece is sleeved on the fixing column, the pressure on the second test piece can be controlled by controlling the counterweight piece, thereby simulating the paint film back tackiness under different pressure conditions, and the experimental data is more consistent with the actual situation.

[0011] Preferably, the first test piece and the second test piece are both tubular and made of steel material, so as to save material, reduce cost, and make the steel material more practical.

[0012] In order to achieve the same purpose, the application also provides a paint film back tackiness testing method, which adopts the paint film back tackiness testing device as described above, and includes the following steps:

[0013] S1, respectively, on the outer circumferential surface of the first test piece and the second test piece, paint film preparation is carried out;

[0014] SS2, after the paint film preparation is completed, a plurality of first test pieces are arranged in different positioning grooves, the second test piece is overlapped on two adjacent first test pieces, the surface of the first test piece in contact with the second test piece is the adhesion surface, a plurality of second test pieces are arranged in the second direction, and the top plate is controlled to move along the track to the outer circumferential surface of the second test piece;

[0015] S3, the paint film back tackiness testing device is placed in a temperature and humidity adjusting box with a preset temperature and a preset humidity;

[0016] S4, after waiting for a period of time, the paint film back tackiness testing device is removed from the temperature and humidity adjusting box, the top plate is disassembled, and the first test piece and the second test piece adhered to each other are separated;

[0017] S5, the paint film damage area is the area of the paint film damage on the adhering surface of the first test piece and the second test piece after being separated, the length of several paint film damage areas on each adhering surface is measured, and the sum of the lengths of the several paint film damage areas on the first test piece in the first direction A1 and the sum of the lengths of the several paint film damage areas on the second test piece in the first direction A2 are calculated respectively, the length of the first test piece and the second test piece in the first direction is B, if A1>A2, the adhering surface reference data C=A1 / B, if A1A2, the adhering surface reference data C=A2 / B, the average of the plurality of adhering surface reference data C is calculated, and the re-adhesion rating is performed according to the average.

[0018] Preferably, before step S1, the step of sanding or mechanical sandblasting the first test piece and the second test piece is included, so that the surface cleanliness of the outer circumferential surface of the first test piece and the second test piece is at least St3.0 level, and the surface roughness is at least medium G level.

[0019] Preferably, step S1 specifically includes: using an air spraying process to spray paint on the outer circumferential surface of the first test piece and the second test piece respectively to prepare the paint film.

[0020] Preferably, after step S1, the step of placing the first test piece and the second test piece in an environment with a temperature of K1 and a humidity of M1 for at least 24 hours after the preparation of the paint film is completed is further included, wherein 23℃≤K1≤25℃ and 45%RH≤M1≤55%RH.

[0021] Preferably, the preset temperature is K2, and 39℃≤K2≤41℃.

[0022] Preferably, the preset humidity is M2, and 78%RH≤M2≤80%RH.

[0023] Compared with the prior art, the paint film tackiness testing device and method has the beneficial effects that: by using the first test piece and the second test piece in a cylindrical shape, the length of the contact surface is the length of the first test piece and the second test piece when the first test piece and the second test piece after the paint film is prepared are in contact, and the width of the contact surface can be approximately ignored, so that when the measurement of the paint film damage area is performed, only the length needs to be measured to calculate the damage ratio of the paint film, the measurement accuracy is higher, the experimental data obtained is more accurate, and the measurement is more convenient, in addition, a plurality of positioning grooves are arranged, so that a plurality of experiments can be performed at a time during the testing to obtain a plurality of experimental data, thereby ensuring the accuracy of the experimental data, and since in the actual use process of the paint film, more is the contact and extrusion between the paint films, the contact and extrusion between the paint films are also simulated in the test, and the real situation of the paint film in the use process can be effectively simulated. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a schematic diagram of the main structure of the paint film tackiness testing device of the embodiment of the present application;

[0025] Figure 2 is a schematic diagram of the main structure of the first test piece of the embodiment of the present application;

[0026] Figure 3 is a flowchart of the paint film tackiness testing method of the embodiment of the present application.

[0027] In the figure, 1 is a base plate, 11 is a positioning groove, 2 is a support, 21 is a track, 3 is a top plate, 4 is a first test piece, 5 is a second test piece, 6 is a counterweight assembly, 61 is a fixed column, and 62 is a counterweight piece. DETAILED DESCRIPTION

[0028] The specific embodiments of the present application will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0029] In the present application, the terms "inner", "outer" and the like indicating the position or location relationship are based on the position or location relationship shown in the drawings, and are only used for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a preset position, be constructed and operated in a preset position, and therefore cannot be understood as a limitation on the present application.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] like Figure 1 As shown, a preferred embodiment of the present invention provides a paint film tackiness testing device, comprising: a base plate 1, a support 2, a top plate 21 track; 3, a plurality of first specimens 4 and a plurality of second specimens 5;

[0032] The top surface of the base plate 1 is provided with a plurality of positioning grooves 11 extending along a first direction, and the plurality of positioning grooves 11 are arranged sequentially along a second direction;

[0033] Both the first specimen 4 and the second specimen 5 are cylindrical, extend along the first direction and have the same length in the first direction. Multiple first specimens 4 are respectively disposed in multiple positioning grooves 11. A second specimen 5 is disposed between two adjacent first specimens 4, and the outer peripheral surface of the second specimen 5 overlaps the outer peripheral surface of two adjacent first specimens 4.

[0034] The bracket 2 is installed on the top surface of the base plate 1 and is spaced apart from the positioning groove 11. The bracket 2 is provided with a track extending in a third direction.

[0035] The top plate 21 is slidably connected to the track; 3 is able to move along the track to contact the outer peripheral surface of the second specimen 5.

[0036] Based on the above scheme, the device uses cylindrical first specimen 4 and second specimen 5 so that when the first specimen 4 and second specimen 5 are in contact after the paint film is prepared, the length of the contact surface is the length of the first specimen 4 and the second specimen 5. The width of the contact surface can be approximately ignored. Therefore, when measuring the damaged area of ​​the paint film, only the length needs to be measured to calculate the damage ratio of the paint film. The measurement accuracy is higher, the experimental data obtained is more accurate, and the measurement is more convenient. In addition, by setting multiple positioning slots 11, multiple sets of experiments can be performed at one time during testing to obtain multiple sets of experimental data, thereby ensuring the accuracy of the experimental data.

[0037] It should be noted that in this embodiment, the end face radii of the first specimen 4 and the second specimen 5 are the same, and two adjacent first specimens 4 are spaced apart to avoid the appearance of paint film damage areas not left by the second specimen 5 on the first specimen 4, which would interfere with the testing of experimental data.

[0038] As Figure 1 shown, further comprising a counterweight assembly 6, the counterweight assembly 6 includes a fixed column 61 and a counterweight sheet 62, the fixed column 61 is installed on the top plate 21 track; 3 away from the bottom plate 1 side, the counterweight sheet 62 is sleeved on the fixed column 61, the pressure on the second test piece 5 can be controlled by controlling the counterweight sheet 62, and then the paint film tackiness under different pressure conditions is simulated, so that the experimental data is more consistent with the actual situation.

[0039] Preferably, the first test piece 4 and the second test piece 5 are both tubular, and the material is steel material, so as to save material and reduce cost, and the steel material is more practical. In the embodiment, the first test piece 4 and the second test piece 5 both adopt Q235 steel pipe, the size is Φ48.3*3.6mm, and the length B is 70mm.

[0040] As Figure 3 shown, the present application also provides a paint film tackiness testing method, which adopts the paint film tackiness testing device as described above, and comprises the following steps:

[0041] S1, respectively, on the outer circumferential surface of the first test piece 4 and the second test piece 5, paint film preparation is carried out;

[0042] S2, after the paint film preparation is completed, a plurality of the first test piece 4 is arranged in different positioning grooves 11, the second test piece 5 is overlapped on two adjacent first test pieces 4, the surface of the first test piece 4 and the second test piece 5 is the adhesion surface, a plurality of the second test piece 5 is arranged along the second direction, and the top plate 21 track; 3 is controlled to move to the outer circumferential surface of the second test piece 5 along the track;

[0043] S3, the paint film tackiness testing device is placed into a temperature and humidity adjusting box with preset temperature and humidity;

[0044] S4, after waiting for a period of time, the paint film tackiness testing device is removed from the temperature and humidity adjusting box, the top plate 21 track; 3 is disassembled, and the first test piece 4 and the second test piece 5 are separated from each other;

[0045] S5, the paint film damage area is the area of the paint film damage on the adhered surface of the first test piece 4 and the second test piece 5 after being separated, the length of several paint film damage areas on each adhered surface is measured, and the sum of the lengths of the paint film damage areas on the first test piece 4 in the first direction A1 and the sum of the lengths of the paint film damage areas on the second test piece 5 in the first direction A2 are calculated respectively, the length of the first test piece 4 and the second test piece 5 in the first direction is B, if A1>A2, the adhered surface reference data C=A1 / B, if A1A2, the adhered surface reference data C=A2 / B, the average of the plurality of adhered surface reference data C is calculated, and the average is used for the adhesion evaluation.

[0046] Based on the above scheme, in the test method, the contact and extrusion between the paint films are also simulated, the real situation of the paint film in use can be effectively simulated, and in particular, the working situation of the paint film between the scaffolding pipes commonly used in construction engineering is simulated. In the test method, five second test pieces 5 and ten first test pieces 4 are prepared, and are divided into groups, one group including one second test piece 5 and two first test pieces 4, and a gap is left between adjacent two groups to avoid the appearance of the paint film damage area on the first test piece 4 which is not left by the second test piece 5.

[0047] In addition, during the calculation of the average, if the error between the two reference data C1 and C2 obtained by one second test piece 5 and two first test pieces 4 in a group exceeds 10%, the group reference data is abandoned and is not included in the calculation of the average.

[0048] Optionally, before step S1, the first test piece 4 and the second test piece 5 are subjected to sandpaper polishing or mechanical sand blasting polishing, so that the surface cleanliness of the outer circumferential surface of the first test piece 4 and the second test piece 5 reaches at least St3.0 level and the surface roughness reaches at least medium G level, so as to avoid that the outer circumferential surface of the first test piece 4 and the second test piece 5 itself damages the paint film and interferes with the collection of experimental data.

[0049] Preferably, step S1 specifically includes: air spraying process is used to spray paint on the outer circumferential surface of the first test piece 4 and the second test piece 5 respectively to prepare the paint film, so as to control the thickness of the paint film, and in the embodiment, the thickness of the paint film is 60±5um.

[0050] Preferably, after step S1, the first test piece 4 and the second test piece 5 are placed in an environment with a temperature of K1 and a humidity of M1 for at least 24h after the preparation of the paint film is completed, wherein 23℃≤K1≤25℃ and 45%RH≤M1≤55%RH.

[0051] In the embodiment, the preset temperature is K2, 39 DEG C <= K2 <= 41 DEG C, the preset humidity is M2, 78% RH <= M2 <= 80% RH, and the period of time is 30 min.

[0052] Reference data C Determination of damage level No damage 0 level C≤5％ 1 level 5％＜C≤15％ 2 level 15％＜C≤35％ 3 level 35％＜C 4 level

[0053] The rating criteria in the embodiment are as shown in the above table.

[0054] In conclusion, the paint film tackiness testing device and method provided by the embodiment of the application use the first test piece 4 and the second test piece 5 in a cylindrical shape, so that the length of the contact surface is the length of the first test piece 4 and the second test piece 5 when the first test piece 4 and the second test piece 5 after the paint film is prepared are in contact, and the width of the contact surface can be approximately ignored. Therefore, when the paint film damage area is measured, only the length needs to be measured to calculate the damage ratio of the paint film, the measurement accuracy is higher, the experimental data obtained is more accurate, and the measurement is more convenient. In addition, a plurality of positioning grooves 11 are arranged, so that a plurality of experiments can be performed at a time during the test to obtain a plurality of experimental data, thereby ensuring the accuracy of the experimental data. In the actual use process of the paint film, more is the contact and extrusion between the paint films. Therefore, the contact and extrusion between the paint films are simulated in the test, which can effectively simulate the real situation of the paint film in the use process.

[0055] The above description is only the preferred embodiment of the application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the application, a number of improvements and replacements can be made, which should be considered as the protection scope of the application.

Claims

1. A method for testing the tackiness of a paint film, characterized in that, A paint film tackiness testing device is used, the testing device comprising: a base plate, a support, a top plate, multiple first specimens and multiple second specimens; The top surface of the base plate is provided with a plurality of positioning grooves extending along a first direction, and the plurality of positioning grooves are arranged sequentially along a second direction; Both the first and second specimens are cylindrical, extend along the first direction and have the same length in the first direction. Multiple first specimens are respectively disposed in multiple positioning grooves. A second specimen is disposed between two adjacent first specimens, and the outer peripheral surface of the second specimen overlaps the outer peripheral surface of two adjacent first specimens. The bracket is installed on the top surface of the base plate and spaced apart from the positioning groove, and the bracket is provided with a track extending in a third direction; The top plate is slidably connected to the track and can move along the track to contact the outer peripheral surface of the second specimen; The testing method includes the following steps: S1. Paint film is prepared on the outer peripheral surfaces of multiple first specimens and multiple second specimens respectively; S2. After the paint film is prepared, multiple first specimens are placed in different positioning grooves, and the second specimens are overlapped on two adjacent first specimens. The surfaces of the first specimens and the second specimens in contact are adhesive surfaces, and multiple second specimens are spaced apart along the second direction. The top plate is controlled to move along the track to the outer peripheral surface of the second specimen. S3. Place the paint film tack test device into a temperature and humidity control chamber with preset temperature and humidity. S4. After waiting for a period of time, remove the paint film tack test device from the temperature and humidity control chamber, remove the top plate, and separate the first and second specimens that are stuck together. S5. The paint film damage area is the area where the paint film is damaged on the adhesive surface of the first and second specimens after they are separated. The length of several paint film damage areas on each adhesive surface is measured, and the sum of the lengths of several paint film damage areas on the first specimen in the first direction, A1, and the sum of the lengths of several paint film damage areas on the second specimen in the first direction, A2, are calculated respectively. The length of the first specimen and the second specimen in the first direction is B. If A1 > A2, then the adhesive surface reference data C = A1 / B. If A1 < A2, then the adhesive surface reference data C = A2 / B. The average of the multiple adhesive surface reference data C is calculated, and the tackiness rating is performed based on the average.

2. The method for testing the tackiness of a paint film according to claim 1, characterized in that, Before step S1, the steps include: sanding the first specimen and the second specimen with sandpaper or mechanical sandblasting, so that the surface cleanliness of the outer peripheral surface of the first specimen and the second specimen reaches at least St3.0 level and the surface roughness reaches at least medium G level.

3. The method for testing the tackiness of the paint film according to claim 1, characterized in that, Step S1 specifically includes: applying paint to the outer peripheral surfaces of the first specimen and the second specimen using an air spraying process to prepare a paint film.

4. The method for testing the tackiness of a paint film according to claim 1, characterized in that, Step S1 is followed by the following step: after the paint film is prepared, the first specimen and the second specimen are placed in an environment with a temperature of K1 and a humidity of M1 for at least 24 hours, wherein 23℃≤K1≤25℃ and 45%RH≤M1≤55%RH.

5. The method for testing the tackiness of the paint film according to claim 1, characterized in that, The preset temperature is K2, where 39℃≤K2≤41℃.

6. The method for testing the tackiness of a paint film according to claim 1, characterized in that, The preset humidity is M2, where 78%RH≤M2≤80%RH.

7. The method for testing the tackiness of a paint film according to claim 1, characterized in that, The testing device also includes a counterweight assembly, which includes a fixed column and a counterweight plate. The fixed column is installed on the top plate on the side opposite to the bottom plate, and the counterweight plate is sleeved on the fixed column.

8. The method for testing the tackiness of a paint film according to claim 1, characterized in that, Both the first and second specimens are tubular and made of steel.

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